@bmiflin
To keep the phone off, press and hold the volume down key and the power button, see the LG LOGO release the power button (the volume down button to hold down), then press the power button after three seconds (the volume of the next key to keep holding down) , After three seconds will automatically enter the factory reset mode, the volume of the next key to select YES, the power button to confirm, you can hard grid.

Note: Restore factory settings will clear the personal data within the phone, if the conditions are saved, then recommend to restore the factory settings.

Most built-in Android accessories can be removed by going to All Apps->Settings->Apps and selecting the app in question. Click "Disable" button if it is not greyed out. This will uninstall the app, but keep its files on your phone's hard drive.

A master reset restores the original factory settings and may delete your personal data on the internal storage, such as downloads, ringtones, images, apps, contacts, and Visual Voicemail. It does not delete data stored on the SIM card or SD card.

Back up data on the internal memory.
From any home screen, tap Apps.
Scroll to and tap Settings.
Tap 'General,' then scroll and tap Backup & reset.
Select or clear the following check boxes:
Back up my data
Automatic restore
Tap Backup account and follow the steps to create Google backup account, if necessary.
Tap Factory data reset.
Review the warning message and select or clear.
Tap Reset phone.
Tap Erase everything.
Tap OK.

Master reset with hardware keys
A master reset restores the original factory settings and may delete your personal data on the internal storage, such as downloads, ringtones, images, apps, contacts, and Visual Voicemail. It does not delete data stored on the SIM card or SD card.

If the device menus are frozen or unresponsive, you can master reset using hardware keys.

Back up data on the internal memory.
Turn off the device.
Press and hold the Power and Volume down buttons on the back of the device.
When the LG logo appears, release and then re-hold the Power button while continuing to hold the Volume downbutton.
The Factory data reset screen appears.
Press the Volume down button to advance the cursor until Yes is selected.
Press the Power button to confirm.
The Erase all user data and restore default settings screen appears.
Press the Volume down button until Yes is selected.
Press the Power button to confirm.
The device will now reset itself. Wait until the process has finished.
Your device now has been reset to its original factory settings.

Soft reset with hardware keys
A soft reset is a simulated battery removal. This is used to power a device off when the screen is frozen or unresponsive and the device it has an internal battery that cannot be removed. It does not cause loss of personal data on the device.

Press and hold the Volume down and Power buttons at the same time for up to 45 seconds, or until the device resets.

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